EP2802752B1 - Elektrisch beheizbarer wabenkörper mit mehreren mit einem anschlussstift elektrisch verbundenen blechlagen - Google Patents

Elektrisch beheizbarer wabenkörper mit mehreren mit einem anschlussstift elektrisch verbundenen blechlagen Download PDF

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Publication number
EP2802752B1
EP2802752B1 EP13700293.7A EP13700293A EP2802752B1 EP 2802752 B1 EP2802752 B1 EP 2802752B1 EP 13700293 A EP13700293 A EP 13700293A EP 2802752 B1 EP2802752 B1 EP 2802752B1
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EP
European Patent Office
Prior art keywords
sheet metal
stack
metal layers
honeycomb body
metal layer
Prior art date
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Application number
EP13700293.7A
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German (de)
English (en)
French (fr)
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EP2802752A1 (de
Inventor
Rolf BRÜCK
Ferdi Kurth
Peter Hirth
Thomas HÄRIG
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Continental Automotive GmbH
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Continental Automotive GmbH
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Publication date
Priority claimed from DE201210000496 external-priority patent/DE102012000496A1/de
Priority claimed from DE102012007020A external-priority patent/DE102012007020A1/de
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2802752A1 publication Critical patent/EP2802752A1/de
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Publication of EP2802752B1 publication Critical patent/EP2802752B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/88—Handling or mounting catalysts
    • B01D53/885—Devices in general for catalytic purification of waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/32—Honeycomb supports characterised by their structural details characterised by the shape, form or number of corrugations of plates, sheets or foils
    • F01N2330/321—Honeycomb supports characterised by their structural details characterised by the shape, form or number of corrugations of plates, sheets or foils with two or more different kinds of corrugations in the same substrate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/42—Honeycomb supports characterised by their structural details made of three or more different sheets, foils or plates stacked one on the other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/44—Honeycomb supports characterised by their structural details made of stacks of sheets, plates or foils that are folded in S-form
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention is in the field of electrically heatable honeycomb bodies, in particular for exhaust gas treatment systems of internal combustion engines, preferably in motor vehicles.
  • Electrically heatable honeycomb bodies are required, for example, to heat components in an exhaust gas purification system, thereby achieving a certain minimum temperature for certain chemical reactions, in particular also for catalytically activated reactions. This is used in catalytic converters, particulate filters or nitrogen oxides reduction systems.
  • a typical design of such an electrically heatable honeycomb body is z. B. in the WO 96/10127 described. Also the EP 1 967 712 B1 shows the structure of an electrically heatable honeycomb body. Both documents show the possibility of supporting such an electrically heatable honeycomb body on an adjacently arranged honeycomb body.
  • typical electrically heatable honeycomb bodies consist of a stack of a plurality of sheet metal layers, which together form at least one middle electrically conductive current path and which are structured such that they are suitable for a gas in one Form axial flow through channels.
  • coarsely structured and finely structured or smooth sheets are alternately stacked on top of each other, for example a total of five to fifteen sheets.
  • an electrically heatable honeycomb body it is advantageous for the stability and the electrical properties of an electrically heatable honeycomb body to build it from alternating coarsely structured and finely structured sheet metal layers, in particular sheet metal layers with a fine first corrugation, with a small first corrugation height and a small first Wavelength and sheet metal layers with a second coarse structure, in particular with a second corrugation with a large second corrugation height and large second wavelength.
  • the corrugated layers within a stack are preferably soldered together at their points of contact.
  • a problem is the electrical connection of the stack with an external power source. Since the tangled electrically conductive stack must be arranged inside a metallic jacket tube, at least one electrically insulated from the jacket tube supply to the stack is required, typically so high currents through the Stack are to be directed that the most uniform distribution of the current to the individual layers of sheet metal of the stack in the contacting desirable or even to avoid damage is required.
  • connection region must not be too high compared to the electrical resistance per unit length in the further course of the stack, so that the connection region does not overheat due to ohmic heat. This is important because on the one hand an electrical connection on the outside must not get too hot and on the other hand just in a connection area Cooling by flowing exhaust gas can not be guaranteed to the same extent as in the rest of the stack.
  • typically power distribution structures are present at which the individual sheet metal layers of the stack end, wherein the power distribution structure is in turn contacted via an insulating guided through the metal shell of the honeycomb body pin.
  • the typical power distribution structure in the described design is a kind of half-shell, which runs parallel to the metal shell and end at the individual sheet metal layers and are metallically connected, in particular soldered, are.
  • This half-shell must in turn be electrically insulated by an insulating layer of the metal shell of the honeycomb body. This can be achieved by an air gap, but it is necessary that the half-shell is also stabilized in position, which is preferably done by additional support pins, again always on the electrical insulation of the structures where the support is respected must become.
  • Object of the present invention is to at least partially solve the problems described with reference to the prior art and in particular to provide a honeycomb body with an electrical connection of multiple sheet metal layers to a pin, which is simple and inexpensive to manufacture, largely avoids a power distribution structure and in particular a stable construction of a electrically heated honeycomb body without shells between the metal shell and the stack of sheets allows.
  • honeycomb body according to claim 1.
  • Advantageous embodiments are described in the dependent claims, which can be combined with each other in a technically meaningful way.
  • the honeycomb body according to the invention with a plurality of electrically connected together with a pin at least one electrically conductive middle current path forming sheet metal layers has a metal shell with an inner circumference through which the pin is passed electrically insulating in a passage.
  • the sheet metal layers are alternately arranged coarsely structured and finely structured or smooth sheets, which together form a stack with a top and a bottom sheet metal layer having channels for a gas in an axial direction through-flow channels between the sheet metal layers.
  • the connecting pin extends in a radial direction through the metal shell and is connected by an electrically conductive connection, in particular by resistance welding, with at least two of the sheet metal layers, preferably at least half of the sheet metal layers, in particular all metal layers, connected directly or via at least one intermediate piece, wherein the electrical resistance per unit length of the average current path in the terminal region is at most 10% greater than an average electrical resistance per unit length of the average current path in the stack.
  • connection area the middle rung may be curved or irregularly shaped from the terminal pin before it runs approximately parallel to the stack.
  • This can also be regarded as a definition of the connection region, so that the connection region is just the region in the vicinity of the connection pin in which the middle current path is not yet substantially parallel to the stack and / or has a different electrical resistance per unit length than in the following History of the pile.
  • the current path must be designed everywhere so that it has no subregions in which the resistance to the ratio of the current flowing there during operation is so high that overheating or even melting of the structure threatens. This is an essential aspect in the design of the connection area. Although local ohmic heat can be dissipated within certain limits to neighboring areas or the surrounding gas, especially when gas flows through the honeycomb body, it is desirable to avoid particularly hot areas under all operating conditions, especially in the vicinity of the terminal pin.
  • the connecting pin is preferably a kind of (rigid) bolt, which serves for the power conduction of, for example, a connecting cable to the sheet metal layers. Even if a plurality of pins may in principle be provided in the honeycomb body, nevertheless the design with a single pin (per electrical contacting of a stack) is preferred. In this case, this connecting pin preferably extends on both sides of the metal shell and through a passage formed therein.
  • the feedthrough may be an opening in the metal jacket adapted to the cross section or the shape of the connecting pin.
  • the implementation is in particular carried out so that no gas can escape between the pin and the metal shell, if necessary, using a sealing material.
  • at least one holding element or a movement compensating element is provided in / on the bushing, so that the connecting pin is securely fixed even with high thermal and / or dynamic stress with these tools.
  • the sheet metal layer In the design of the sheet metal layer different basic shapes can be used. If no structures are embossed in the sheet metal layer, is spoken of smooth sheet metal layers regularly, even if these are in the metal shell a total of z. B. S-shaped, spiral, U-shaped, etc. bent / wound are arranged. If the sheet metal layers have embossed structures (waves, steps, nubs, etc.), these are referred to as structured sheet metal layers.
  • sheet metal layers with different structures are described as “coarsely structured” and have a (in comparison) smaller structuring referred to as “finely structured”. It is possible that all metal layers of the honeycomb body form a (single) or multiple stacks, which are then arranged electrically isolated from each other.
  • channels can be formed so that the gas stream can penetrate the honeycomb body. Since this gas stream enters at a first end side and exits at a second end side, the gas can thus be guided in the "axial" direction through the honeycomb body.
  • the channels themselves are substantially parallel to the axial direction, this is not mandatory. It is also possible that at least a part (possibly also all) channels inclined to the axial direction, wavy, helical, etc. (but at least have a connection to the two end faces).
  • the electrical conductive connection can be realized by direct contact between pin and sheet metal layer ("direct") and / or by (at least) an intermediate piece, wherein the intermediate piece (electrically conductive) positioned between the pin and the sheet metal layer and in particular on both components (cohesively ) is attached.
  • the intermediate piece may e.g. be (form-) more stable than the sheet metal layers executed to have a suitable receptacle for one end of the terminal pin and / or realize a current distribution function from a small cross-section of the terminal pin to a (for example up to 300%) larger area of the at least one sheet metal layer.
  • an intermediate piece is useful for evenly distributing a current in the terminal area over the axial extent of the stack.
  • the intermediate piece has only a very small extent in the circumferential direction of the metal shell, z. B. 2 to 10 mm. It can also be arranged in the interior of the stack, so that at least part of the sheet metal layers is fastened to the outside of the intermediate piece.
  • the sheet metal layer does not constitute an inner jacket and / or an inner tube which is (concentric with or) positioned in the metal jacket.
  • the sheet metal layer extends from an edge of the honeycomb body (near the metal shell) towards a center region or the center of the honeycomb body (and possibly also at least once again towards the edge).
  • the uppermost sheet metal layer in the stack extends over at least 35% of the inner circumference approximately parallel to the metal casing and is separated therefrom by an air gap.
  • the air gap includes, in particular, a space essentially free of built-ins or components, which does not exclude, however, that electrically insulating installations for stabilizing the air gap or electrically insulating coatings on the adjacent surfaces are present. Consequently, the air gap extends in particular from the inner surface of the metal shell to the surface of the opposite sheet metal layer. The air gap extends (contiguously) in the circumferential direction over at least 35% of the inner circumference of the metal shell.
  • the air gap in order that the stack runs (approximately) parallel to the metal jacket, the air gap (at least in wide ranges) has a (roughly) constant gap width (if the possibly provided structure of the uppermost / outermost sheet metal layer and / or the peripheral edge areas of the air gap neglected).
  • Such an air gap is preferably provided at least between the connecting pin and a circumferentially adjacent bearing point (support pin) of the sheet metal layer toward the metal jacket.
  • the air gap is also formed in the (axial) area / cross section of the honeycomb body in which the terminal pin is provided.
  • the uppermost sheet metal layer in the stack even extends over at least 40% of the length of the inner circumference (approximately) parallel to the metal shell and is separated therefrom by an air gap. Looking at the honeycomb body from its front side in the axial direction and divides it in 360 ° angle range, so the uppermost sheet metal layer preferably extends over an angular range of slightly less than 180 ° parallel to the metal shell, but at least about 144 °, depending on the exact shape the connection area and the course of the stack in the interior of the honeycomb body.
  • the uppermost sheet-metal layer preferably also the lowermost sheet-metal layer of the stack, is a finely structured or smooth sheet-metal layer. This is particularly advantageous because preferably the uppermost and / or the lowest sheet-metal layer of the stack can be metallically connected to the pin, whereby the remaining sheet metal layers are quasi enclosed and their ends, even if they can not be connected to the pin, have no freedom of movement and therefore can not cause electrical short circuits.
  • the function of the uppermost and / or the lowermost sheet metal layer can be supported by the fact that one or both at least in some areas have a thickness reinforcement and / or are thicker than the other sheet metal layers.
  • the thicker portions may have a sheet thickness of 80 to 200 microns [micrometers], more preferably 110 to 170 microns, while the remaining sheet metal layers typically have a thickness of 20 to 60 microns.
  • a greater thickness can be achieved either by using thicker sheets in the desired area and / or by the fact that the uppermost or the lowermost sheet metal layer in the relevant area consists of two or three adjacent sheet metal layers which may be jointly structured. In any case, it is preferred that these thicker sheet metal layer is still significantly thinner than the metal shell, the z. B. has a thickness of more than 1 mm [millimeters].
  • the lowermost sheet metal layer has a thickness reinforcement at least in one connection region and along a part of the stack and / or is thicker than the remaining sheet metal layers. Making both outer sheet layers thicker facilitates the metallic connection to the pin, especially when the method of resistance welding is used.
  • At least the uppermost sheet metal layer of a nickel, chromium and iron-containing steel also known under the name NiCroFer.
  • NiCroFer a nickel, chromium and iron-containing steel
  • the mechanical and electrical properties, in particular the good electrical conductivity and high-temperature corrosion resistance of this material cause a special suitability for the requirements of the uppermost sheet metal layer.
  • the coarsely structured sheet metal layers have a second wavelength which is greater than a first wavelength of the finely structured sheet metal layers, namely at least a factor of 1.5. It is also preferred that this factor does not exceed a value of 5, in particular not a value of 3. In the selection of well heights and wavelengths of the coarse and finely structured sheet metal layers technically reasonable limits are observed. In particular, the conditions and corrugations should be chosen so that as possible no channels with a very small cross section arise, which can possibly be clogged in a coating.
  • this compound is preferably carried out only with smooth or finely structured sheet metal layers and in particular by resistance welding.
  • the connecting pin can also be metallically connected with the interposition of an intermediate piece with sheet metal layers of the stack, wherein the intermediate piece comprises a plurality of sheet metal layers of the stack in a connection region.
  • the use of an intermediate piece may be advantageous if the thickness of the sheet metal layers compared to the cross section of the terminal pin is too small for a direct weld or sufficient contact pressure during welding can not be achieved. Nevertheless, a connection of pin, spacer and sheet metal layers in some embodiments in a welding process is possible.
  • connection area has a roughly constant (maximum 10% larger) or preferably even has a lower electrical resistance per unit length than the stack in the course, in particular at least 10% and more preferably at most 20% lower electrical resistance per unit length, so that the connection area can not heat up too much, because the resulting low Ohm heat is sufficiently dissipated in the stack or pin.
  • this is not always achievable if one dispenses with current distribution structures, in particular half-shell-shaped current distribution structures.
  • a connection of the sheet metal layers designed in this way with the connecting pin or an intermediate piece is to be produced such that the resistance per unit length in the connection region is not more than 10% above the average resistance per unit length of the stack.
  • the resistance per unit length in the connection area should deviate even less from that of the stack or even fall below it.
  • the terminal pin is metallically connected to two (2) to five (5) sheet metal layers of the stack on an area of at least 10 mm 2 [square millimeters], the connecting end of the terminal pin being 3 to 8 mm [millimeters], preferably 4 to 6 mm, is spaced from the inner periphery of the metal shell.
  • the electrical connection can introduce the required electrical currents into the stack and stabilize it at the same time with a sufficient distance from the metal shell, so that an electrical insulation between the stack and metal shell is ensured by an air gap.
  • the preferred embodiment of the invention is an inverse entanglement of the stack in the manner of an S-shape, wherein the turns of the stack are electrically insulated from one another by air gaps.
  • At least the thicker upper sheet metal layer of the stack or its thickness reinforcement extends only over part of the length of the stack, preferably up to an inner end approximately in the center of the honeycomb body.
  • the top sheet metal layer of the stack has particular functions.
  • this uppermost sheet metal layer over almost half of the inner circumference forms the boundary to the insulating air gap relative to the metal sheath, it serves the electrical connection to the pin and limits the not connected to the pin inner sheet metal layers.
  • the uppermost sheet-metal layer has a thickness reinforcement or is thicker than the other sheet-metal layers, then it has proven advantageous if this takes place only over part of the length of the stack, preferably to about the middle of the honeycomb body. It has been found that in this portion of the stack, the uppermost sheet metal layer can simultaneously serve to distribute the electrical current in the stack.
  • the current always seeks the shortest path or the lowest electrical resistance, which is why it tends to flow to the inner region of the stack, which is compensated by a thicker upper sheet metal layer.
  • the opposing intertwining of the stack causes the uppermost sheet metal layer to be at the lowest sheet metal layer, which is why it is advantageous to leave it there at the latest or continue from there to a thinner layer. This can be done, for example, at one of the points at which the entanglement also changes direction.
  • the stack by a plurality of support pins in shape, with at least one support pin at a distance of less than 10 cm, preferably less than 5 cm, more preferably less than 2 cm, along the course of the stack measured away from the pin is arranged. This serves in particular to stabilize the air gap with respect to the metal shell.
  • Fig. 1 shows a schematic representation of a portion of an electrically heatable honeycomb body 14 which is arranged in a metal shell 7.
  • the honeycomb body 14 contains a stack 5 of smooth or finely structured sheet metal layers 1 alternately arranged with corrugated or roughly textured sheet metal layers 2, wherein the stack 5 has a top sheet metal layer 3 and a lowermost sheet metal layer 4, which are both finely structured in the present embodiment.
  • the coarsely structured sheet metal layers 2 end one after the other within the stack 5, while the finely structured sheet metal layers 1 are guided further into a connection region 6, where they are connected to the connection end 15 of a connection pin 12, preferably welded, in particular by resistance welding.
  • the connecting pin 12 is guided through a passage 10 through the metal shell 7 and insulated by an electrical insulating layer 11 of this.
  • the insulating pin 12 extends in a radial direction R, as indicated by an arrow.
  • the coarse and finely structured sheet metal layers 1, 2 form channels 18, which extend in an axial direction A, likewise indicated by an arrow.
  • the metal shell 7 has an inner circumference I, which is also indicated by arrows.
  • At least the uppermost sheet-metal layer 3 and the lowermost sheet-metal layer 4, and preferably also further finely structured sheet-metal layers 1, are connected in an electrically conductive connection 13 to the support pin 12.
  • the stack 5 is stabilized by support pins 17, which are supported on an adjacent further honeycomb body, not shown here.
  • the sheet metal layers 1, 2, 3, 4 in the stack 5 together form a middle (theoretical) current path 23, as indicated by arrows, which has a mean electrical resistance per unit length, ie a typical average resistance along the course of the stack. 5
  • Fig. 2 illustrates the size ratios of the structures and corrugations of the sheet metal layers 1, 2, 3, 4.
  • the finely structured sheet metal layers 1 in the stack have a first corrugation with a first corrugation height H1 and a first wavelength L1, which are both smaller than a second corrugation of coarse structured sheets 2, which a second well height H2 and have a second wavelength L2.
  • the uppermost sheet-metal layer 3 can moreover have a greater thickness T than the remaining sheet-metal layers 1, 2 of the stack.
  • Fig. 3 . 4 and 5 schematically show various possibilities according to the invention, how the stack 5 form a connection region 6 and can be attached to a connection end 15 of a connection pin 12.
  • Fig. 3 1 illustrates an embodiment in which the stack 5 is increasingly squeezed together in a connection region 6 in the direction of the connection pin 12, wherein all or the majority of the sheet metal layers 1, 2, 3, 4 have an electrically conductive connection 13 to the connection end 15 of the connection pin 12 , in particular the top 3 and the bottom 4 sheet metal layer.
  • Fig. 4 shows a little over the embodiment of Fig. 3 modified form of the terminal portion 6, in which the corrugated sheet metal layers 2 are not squeezed together, but in the connection area 6 ends, so that only the top 3 and the bottom 4 sheet metal layer and optionally a part or all of the smooth or finely structured sheet metal layers 1 electrically conductive with the Terminal end 15 of the connecting pin 12 are connected.
  • Fig. 5 1 illustrates another variant of the connection region 6, in which all or a part of the inner sheet metal layers 1, 2 terminate one after the other in the connection region 6, preferably at the uppermost sheet metal layer 3, so that the connection region 6 tapers slowly in the direction of the connection end 15 of the connection pin 12 , wherein at least the top 3 and the bottom 4 sheet metal layer form an electrically conductive connection 13 with the terminal end 15 of the terminal pin.
  • Fig. 6 schematically shows how the terminal portion 6 of a stack 5 of finely structured 1 and roughly structured 2 sheet metal layers is designed in another embodiment.
  • a pin 12 the In turn, by means of an electrical insulating layer 11 is insulated from a bushing 10 by a metal jacket, not shown, ends with its connecting end 15 to an intermediate piece 9 and is electrically connected to this and possibly with underlying ends of the sheet metal layers 1, 2, preferably welded or soldered.
  • the intermediate piece 9 comprises the end of the stack 5 in the connection region 6, the exact configuration of the connection region 6 being possible in various embodiments, as described above. All sheet metal layers may preferably be increasingly compressed or executed with ever lower corrugation height in order to achieve the desired tapered shape.
  • a support pin 17 can in turn stabilize the entire assembly.
  • Fig. 7 schematically another design of the support pin 12 is described, which has at its connection end 15 has a recess 18 in which two or more sheet metal layers 1, 2 of the stack 5, preferably all sheet metal layers 1, 2, are inserted. Again, various methods for rejuvenation of the stack 5 come into consideration.
  • the electrically conductive connection is preferably carried out by welding or soldering.
  • Fig. 8 shows a frontal overall view of another embodiment of a honeycomb body 14 according to the invention with an oppositely twisted S-shaped stack 5 of sheet metal layers 1, 2.
  • the stack 5 has a topmost sheet metal layer 3, starting from a terminal portion 6 to its inner end 20 approximately in the Center of the honeycomb body 14 has a greater thickness T than the other sheet metal layers 1, 2 has.
  • the top sheet metal layer 3 would be the lowest sheet metal layer, which is why it ends inside. But this may be the thicker sheet metal layer 4, which is then another upper sheet metal layer 22, be made thicker from an inner end 21 of the other upper sheet metal layer 22 and also made of a different material, in particular an alloy with Nickel, chrome and iron.
  • the stack 5 also has a lowermost sheet-metal layer 4, which likewise has a greater thickness T than the remaining sheet-metal layers 1, 2, starting from the connection region 6 over a partial region of 5 to 30 cm.
  • a multiplicity of support pins 17 extend along the length of the stack 5 distributed.
  • the one end of the stack 5 is formed into the tapered terminal portion 6 and connected to a connection end 15 of a terminal pin 12.
  • all sheet metal layers 1, 2 can be guided to the pin or, as described above, only a part of the sheet metal layers 1, 2.
  • the pin 12 is guided by a metal jacket 7 by means of a bushing 10 with electrical insulating layer 11 radially outward.
  • the stack 5 is electrically insulated from the metal shell 7 by means of an air gap 8.
  • the individual turns of the stack 5 are electrically isolated from each other by an air gap.
  • the sheet metal layers 1, 2, 3, 4 of the stack 5 form an indicated by arrows middle current path 23rd
  • FIGS. 9 and 10 illustrate schematically that it is not mandatory according to the invention, the connection area 6 end exactly at the terminal end 15 of the connecting pin 12. It is Z. B. for manufacturing reasons, quite possible to contact the stack 5 a piece before its end, the construction can still do without shells or similar power distribution structures. This is because the most critical area of the stack 5 in the vicinity of the pin 12, where relatively high electrical current densities may occur during operation, by the solid pin 12 itself and by the "overhanging" portion of the stack 5, the operation only low current densities has, is well cooled.
  • An electrically highly conductive uppermost sheet-metal layer 3, optionally also with a greater thickness T, is advantageous in these embodiments.
  • At least one further sheet-metal layer 1, 2 must be electrically conductively connected to the connection end 15 of the connection pin 12 in order not to generate excessive current densities in the uppermost sheet-metal layer 3. This can for example be detected by a two or more sheet metal layers Welded connection or a suitable solder joint can be achieved.
  • an intermediate piece 9, can be used to increase the contact area to 200 to 300% of the cross-sectional area of the connecting pin 12 between pin 12 and stack 5. Depending on the length of the over the pin 12 projecting part of the stack 5, it makes sense to protect this part by at least one support pin 17 against vibrations and against deformation, which could lead to an electrical contacting of the metal shell 7.
  • the present invention enables a simple and economically producible structure of an electrically heatable honeycomb body, which allows a very uniform current distribution and thus heating even without power distribution structures or supporting half-shells in the outer region.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Catalysts (AREA)
  • Laminated Bodies (AREA)
EP13700293.7A 2012-01-13 2013-01-11 Elektrisch beheizbarer wabenkörper mit mehreren mit einem anschlussstift elektrisch verbundenen blechlagen Active EP2802752B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE201210000496 DE102012000496A1 (de) 2012-01-13 2012-01-13 Elektrisch beheizbarer Wabenkörper
DE102012007020A DE102012007020A1 (de) 2012-04-05 2012-04-05 Elektrischer Anschluss von mehreren Blechlagen eines elektrisch beheizbaren Wabenkörpers und zugehöriger Wabenkörper
PCT/EP2013/050485 WO2013104754A1 (de) 2012-01-13 2013-01-11 Elektrisch beheizbarer wabenkörper mit mehreren mit einem anschlussstift elektrisch verbundenen blechlagen

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EP2802752A1 EP2802752A1 (de) 2014-11-19
EP2802752B1 true EP2802752B1 (de) 2016-05-04

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US (1) US9393521B2 (ru)
EP (1) EP2802752B1 (ru)
JP (1) JP6173349B2 (ru)
KR (1) KR20140105570A (ru)
CN (1) CN104053876B (ru)
RU (1) RU2595463C2 (ru)
WO (1) WO2013104754A1 (ru)

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EP3943720A1 (de) 2020-07-23 2022-01-26 Benteler Automobiltechnik GmbH Elektrische heizvorrichtung

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JP6420803B2 (ja) 2016-09-23 2018-11-07 本田技研工業株式会社 排気ガス浄化触媒加熱装置
DE102017203546B4 (de) 2017-03-03 2023-08-03 Vitesco Technologies GmbH Katalysator mit elektrisch beheizbarer Heizscheibe
JP2018178768A (ja) * 2017-04-05 2018-11-15 日本特殊陶業株式会社 内燃機関の触媒装置
DE102017207151A1 (de) * 2017-04-27 2018-10-31 Continental Automotive Gmbh Metallischer Wabenkörper mit haftungsverbessernden Mikrostrukturen
JP7047604B2 (ja) * 2018-06-01 2022-04-05 トヨタ自動車株式会社 電気加熱式触媒装置
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FR3098026A1 (fr) * 2019-06-28 2021-01-01 Faurecia Systemes D'echappement Connecteur électrique solidarisé à un élément conducteur longiforme, notamment pour un dispositif de purification de gaz d’échappement
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EP2802752A1 (de) 2014-11-19
US9393521B2 (en) 2016-07-19
KR20140105570A (ko) 2014-09-01
JP6173349B2 (ja) 2017-08-02
US20140322090A1 (en) 2014-10-30
RU2595463C2 (ru) 2016-08-27
CN104053876A (zh) 2014-09-17
RU2014133061A (ru) 2016-03-10
WO2013104754A1 (de) 2013-07-18
JP2015504780A (ja) 2015-02-16
CN104053876B (zh) 2016-08-17

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